GTA
General Discussion To Gateway To Airguns => Gamo Gate => : redroush00 February 20, 2010, 11:16:17 AM
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I allways wanted a .22 and i saw a beaman dual caliber at Wallmart for 125.00. I dont think using the same power plant is efficient. How many do this ? If the Beaman is 1000 fps in 177 it cant be impressive with 22... :0
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Most springers use the same power plant for both cals as far as I know but there may be some out there that I'm not aware of with different power plant's. Ed
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What Ed said is true and remember... even though the .22 cal pellet is going to be traveling slower it will have more FPE when it connects with the critter you're pointing it at :)
Jeff
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Typically both .22 and .177 use the same port size. Many have tried to alter the port but have ruined there guns.
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gamo are notorious for that except for muzzle and stock its all the same lol bone collector,socom
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Yup don't go reaming out the port hole gang in hopes of increasing the fps is does the opposite . :0 Ed
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okay so now i know that this is the norm.
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Yes this is pretty much the norm. But it's really not that big an issue as the ratios are similar between caliber to bore size to pellet weights, to this and that. I really don't know the scientific/mathmatical equations, but comparatively speaking, they're about even. Keep in mind that velocity is secondary to accuracy. All to often, most people that get involved with air guns (myself included) try to over lap ideologies of powder burning guns to air guns, when in fact they are two totally different shooting disciplines. Jeff made an excellent point though with regards to fpe's!! tjk
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Since the sound of the gun reaches the game bfore the pellet, the faster the better. As it is there is a noticable delay shooting 800-900 fps with a 177 at 30 yards before the pellet hit the target. Thats just enogh time for the game to *_*_*_*_*_* up a bit. A 22 at a slower speed might just be enough to have the animal move slightly before the pellet impacts the sweet spot.
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I understand where you're coming from with the speed to sound theory,...but an average weight pellet suitable to be shot from a springer type rifle will lose stability in flight because the pellet weight is insufficient travelling at +1000 fps velocities ( for 1000 fps rated rifles like Gamo's, Crosmans, etc). POI will fluctuate and consistancy will drop off. Some pellet types more than others. Lighter moreso than heavier pellets. I call it the "Whiffle-Ball Effect". Hence the desired results ( pin-point accuracy) will be compromised and the chances of a clean kill or even a hit will diminish greatly. With these rated springers (1000 fps's), 850 fps seems to be the ideal velocity for hunting 30 yards and in. But this is not often the case with PCP type weapons that can handle shooting heavier pellets at higher velocities. True Magnum Springers can be an exception,...but only with the correct weight pellets and there isn't really to much of a difference. Correct pellet weight to velocity is the general rule,....finding that 'golden' pellet,.....is the big challenge for consistant accuracy and over all optimal performance.
As for lightning speed critters,..not too likely,...either I'm way off on this one,..... or I've been fortunate enough to come across ALOT of deaf, blind, slow, or stupid critters. LOL's Even with an old Marksman 0035 shooting sub 625 fps in .177 cal at 25 to 30 yards. Happy Hunting!! tjk
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Ever hear an arrow whistling through the air? An arrow is only traveling through the air at about 260 fps on average, yet by the time the animal (at 20 yards) reacts to the sound, it's already a dead animal running. Air gun shooting and archery share very similar characteristics. The most important one being distance. Limiting your killing distance to less than 30 yards will make you more effective at taking game. Anything further and your projectile will have lost a lot of its kinetic energy and be greatly affected by crosswinds. At longer distances, an animal will also have a little more time to react to the sound. Unless you're shooting high powered PCP rifles with 30 grain slugs at 1000 fps, you won't be taking 100 yard shots and grouping on a quarter.
And yes, air rifles with the same designation, shooting two (or three) different calibers will use the same powerplant, for the most part.